package com.doumee.core.utils;
|
|
|
import org.apache.commons.lang3.StringUtils;
|
import org.slf4j.Logger;
|
import org.slf4j.LoggerFactory;
|
|
import java.security.SecureRandom;
|
import java.util.Random;
|
|
/**
|
* A null-safe utility to handle the String instances.
|
*
|
* @author Guang YANG
|
* @version 1.1
|
*/
|
public final class Strings {
|
|
public static final String EMPTY = "";
|
public static final String INSTANTIATION_PROHIBITED = "Instantiation prohibited.";
|
private static final Logger LOGGER = LoggerFactory.getLogger(Strings.class);
|
|
private Strings() {
|
throw new AssertionError(INSTANTIATION_PROHIBITED);
|
}
|
|
/**
|
* Generate random string with alpha and numeric of given length.
|
*/
|
public static String randomAlphanumeric(int length) {
|
return new RandomString(length).nextString();
|
}
|
|
public static String randomNumeric(int length) {
|
return new RandomString(length, new SecureRandom(), "0123456789").nextString();
|
}
|
|
public static String getRandomNumberString(Integer strLength) {
|
|
Random rnd = new Random();
|
|
String str = "9999";
|
|
if(strLength >= str.length()){
|
str = StringUtils.leftPad(str,strLength,"9");
|
}
|
|
int number = rnd.nextInt(Integer.parseInt(str));
|
|
return String.format("%06d", number);
|
|
}
|
|
|
}
|
